Method of preparing coumarone-indene resins



Patented July 8, 1930 ROBERT W. OSTERMAYER, OF PITTSBURGH,

CHEMICAL COMPANY, A CORPORATION OF PENNSYLVANIA METHOD OF PREPARING CO UMARON E-IN DEN E RESIN S 1929. Serial No. 374,281.

No Drawing. Application filed June 27,

This invention relates to the derivation of a a resin from coal tar distillates, and constitutes more specifically an improvement on the method of preparing coumarOne-indene lar advantages consequent upon the grade of resins as described and claimed in Patent N o. isti ate emplo ed. erein I claim the use 1,705,857, issued March 19, 1929, to Ralph M. of petroleum distillates which are lower on mery. he aum scale than petroleum benzine, the

In the patent above noted crude solvent naphtha N o. 2, having a'coumarone-indene component up to 80% of the whole, is polyclaimed in my copending applicatl merized, and is then diluted with petroleum N 0. 374,282, filed June 27, 1929.

benzine to precipitate undesired substances, ccording to my method of procedure Which separate by gravity from the liquid crude solvent naphtha is prepared for distilcontaining the desired products. lation in the usual manner. It may then be By coumarone-indene, as used throughdistilled, and several cuts taken, which va out the specification and claims, I mean comfrom those containing a relatively small perpolnents and Iresins plonlslistiing chiefly of tlhese centilage of thelcoumarone indene components su stances, ut W ic requent y inc ude to t e resin oi s containin a relativel reat lesser quailntities (if otheir resilnouls1 substances. percentage, as iliigh as 80 7%, or more, di" these 7 on t e mem ers o suc 0t er resinous components. mixture of low meltin oint 0 substaiices which have been isolated are the resin is left as a still residue. I mag then fo owing, constituting a partial list only: comnliingle the cuts or proceed with them separate y. giggz zg g gfgg I then subject either the separate cuts, or Meth i g 4 the refined -naphtha Without fractionation to y (0 H (C H O) (CH the action of a suitable polymerizing agent, Dimeth 1 i fi 2 2 such as sulphuric acid, anhydrous stannic y (C H (C H O) (OH tetrachloride, or anhydrous phosphoric acid. Trimethvl 2 a t the completion of the polymerizing step, a

(O H) (C H O)-(CH eavy viscous product is obtained. This Hydrindene a H 8 heavy viscous product I dilute with a liquld icyclo entadign petroleum distillate lower on the Baum scale 01659 (C H than petroleum benzine. The undesired yr 6 5 2 products of polymerization being insoluble istillate .are t tated, and the remaining liquid comprising p the diluent and the desired polymerized substances are decanted from the precipitates. ccording to previous procedure, the liquid is then washed free of th and remaining impurities. tilled, the distillation being As in the Emery patent above noted I add a diluent to th solvent naphtha after the of the process, the present method thus difl'ering from my copending application Serial N 0. 372,542, filed June 20, 1929. As in the mery process, also, I prefer to polymerize solvent naphtha having a coumarone-indene It is then disdesirably under hus precipie polymerized agent content which is'not' substantially greater a high vacuum 1n order to remove the solthan 80% of the whole. vents more rapldly than is possible under a ile petroleum benzine gives the best low vacuum or at atmospheric pressure. The

resinous material in the still is then steamed for removal of heavy oils, and the remaining resinous residue constitutes the desired resins, free both of the undesired products of poly merization and free also of average results as a diluent added after polymerization, with reference both to melting point and clarity of the product and ease of separation during the concluding steps of the process, I have found that petroleany undesired polymerized oil with which the resin may up to that point have been associated. The pure resin residue is drawn E, and cooled.

The procedure according to the Emery 5 patent, and my present method, is somewhat simpler than is the case where the diluent is added before the completion of the polymerizing step. Absolute completion of the polymerized reaction cannot, however, be approximated so closely as when the diluent is added before the completion of the polymerizing step.

By utilizing as a diluent a petroleum distillate lower on the Baum scale than petroleum benzine, I secure the precipitation of certain substances, which are not fully precipitated by the use of petroleum benzine, or lighter petroleum distillates, as a diluent. The resulting coumarone-indene resin has a higher melting point, and is of a greater clarity than the resin obtained by the use of petroleum benzine, or a lighter distillate, as a diluent.

There is greater difliculty in avoiding emulsification of the product during the step of washing it free of the polymerizing agent, and greater difficulty in distilling the diluent from the desired resinous product than is the case with petroleum benzine and petroleum distillates lighter than petroleum benzine. The use of the heavier diluent is, however, desirable when it is important to obtain a coumarone-indene resin havin an increased melting point, and which is o unusual clar- It should be understood that petroleum benzine, or an even lighter petroleum distillate may be commingled with the heavier oil without departing from the spirit of the invention; which is to utilize a diluent comprising a petroleum distillate lower on the Baum scale than petroleum benzine, an thereby secure a product of increased purity by a peculiarly complete precipitation of impurities.

5 What I claim is:

The method herein described of deriving resin from coal tar distillate which consists in preparing a distillate having a coumaroneindene content, polymerizing the prepared 5 distillate with the production of incidental precipitates, diluting the polymerized mass with a petroleum distillate lower on the Baum scale than petroleum benzine in which diluent such precipitates are insoluble, re-

moving such precipitates, and separating the dissolved resin.

In testimony whereof I have hereunto set my hand.

ROBERT W. OSTERMAYER. 

